<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">I still play LP's . . . . . . none of that chopped-up digital for me, analog forever !!!!!<br><br>Bob Kane<br>
getterflash@yahoo.com<br><br>--- On <b>Tue, 3/23/10, Atwood, Mark <i><atwoodm@paragon-inc.com></i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: Atwood, Mark <atwoodm@paragon-inc.com><br>Subject: Re: [NSRCA-discussion] curious - Transmitter Specs...<br>To: "General pattern discussion" <nsrca-discussion@lists.nsrca.org><br>Date: Tuesday, March 23, 2010, 3:05 PM<br><br><div id="yiv1737616691">
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<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">All of this seems very reminiscent of CD’s first coming to
the market.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">New technology invariably brings a shift in the metrics and
specs that we use to evaluate it. So yes, Latency is the new holy grail,
but that’s probably accurate.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Quick rewind. Prior to CDs, shopping for stereo equipment
was all about reading the specs, Total harmonic distortion, Signal to Noise
ratios, blah blah. Good specs (for the most part) meant good sound.
And as with all multi component systems, quality depended on the lowest quality
component in the system. A great amp was only as good as the speakers it
was driving…and so forth.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Then came Compact Discs, and initially, people were still looking
at Signal to Noise ratios on CD players. It took a few years before it
set in that the signal to noise ratio was SO high (unlike a phono or tape deck)
that even the crappiest CD players had Signal to Noise ratios that were far
superior to anything the human ear could hear and THD that was for all
purposes, zero. On the other hand, new specs DID add value. Sampling
rate, digital to analog conversion rates, etc, became the new measures by which
to purchase. As these have evolved, even those became
meaningless to all but the extreme audiophile as again, even the cheapest
players had specs that exceeded our ability to hear the difference.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">We have the same phenomenon occurring in our hobby.
Latency is a new measure for all intents and purposes, since in there was
little variability in the PPM and AM days. </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">I would argue to all that resolutions above 512, and certainly
above 1024, are no longer the weakest component in the system. Slop in
our servo gears and control linkages, even the best ball bearing ones,
still exceed that of a single point of resolution at 1024.
That’s good news. Just like with CD’s, it means even
the less expensive radios now have resolution that exceeds our needs. </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Latency has become a concern only because the early versions of
2.4 had some high latency. I can NOT knock pioneers who pave the way for
the rest to follow and improve on. We only have faster systems because
they brought the first “slow” ones to market and gave us a starting
point.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">But we’re quickly approaching the point where IMHO, latency
will be just as irrelevant as resolution in that all the systems will be faster
than we’re able to perceive and discern any difference.</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Yeah, there will always be those that purchase on the technical
superiority of a product, but practically speaking, they’ll be
equals. </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Ok, that’s my $0.02</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">I think I’ll go play an album…</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<div>
<p class="MsoNormal"><b><span style="font-size: 10pt; font-family: "sans-serif";">Mark
Atwood</span></b><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"></span></p>
<p class="MsoNormal"><b><span style="font-size: 9pt; font-family: "sans-serif";">Paragon
Consulting, Inc.</span></b><span style="font-size: 9pt; font-family: "sans-serif";"> </span><b><span style="font-size: 10pt; font-family: "sans-serif";">|</span></b><span style="font-size: 9pt; font-family: "sans-serif";"> President</span><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"></span></p>
<p class="MsoNormal"><span style="font-size: 8.5pt; font-family: "sans-serif";">5885 Landerbrook Drive
Suite 130, Cleveland Ohio, 44124</span><span style="font-size: 10.5pt; font-family: "sans-serif";"> </span><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"></span></p>
<p class="MsoNormal"><span style="font-size: 8.5pt; font-family: "sans-serif";">Phone:
440.684.3101 x102 </span><b><span style="font-size: 9pt; font-family: "sans-serif";">|</span></b><span style="font-size: 8.5pt; font-family: "sans-serif";"> Fax: 440.684.3102</span><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"></span></p>
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</span><b><span style="font-size: 9pt; font-family: "sans-serif";">|</span></b><span style="font-size: 8.5pt; font-family: "sans-serif";"> </span><span style="font-size: 8.5pt; font-family: "sans-serif"; color: rgb(19, 81, 243);"><a rel="nofollow" target="_blank" href="http://www.paragon-inc.com/">www.paragon-inc.com</a></span><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"></span></p>
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<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
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<p class="MsoNormal"><b><span style="font-size: 10pt; font-family: "sans-serif"; color: windowtext;">From:</span></b><span style="font-size: 10pt; font-family: "sans-serif"; color: windowtext;">
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org] <b>On Behalf Of </b>Bill's
Email<br>
<b>Sent:</b> Tuesday, March 23, 2010 12:45 PM<br>
<b>To:</b> General pattern discussion<br>
<b>Subject:</b> Re: [NSRCA-discussion] curious</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Andrew Jesky wrote: </p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">I’m with you on this one Mark, I could notice the latency
a little bit in some systems but the servo grouping is nothing that I can tell.
I think the guys that really see this are the heli guys. I have talked to many
of them and they do tend to tell me they can “feel” the difference.
They are using much more servo throw all the time between positive and negative
collective as well as cyclic. </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);">Andrew</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; font-family: "sans-serif"; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal" style="margin-bottom: 12pt;"><br>
<br>
Andrew is right, this all got started with the heli guys who flew CCPM. On a
big plane grouping is noce just to minimize servo stress and current draw, but
it is not something you are going to feel while flying. And in a glider the
only thing I ever work hard on matching is that the flap throw is matched
through the entire range of movement.<br>
<br>
Like I said, a couple of years ago nobody even heard of latency, now it is the
Holy Grail.<br>
<br>
<br>
<br>
<br>
</p>
</div>
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